I need context to answer definitively but apostrophes show possession but there are also possessive pronouns (Mine, His, Hers, Yours, Its, Ours, Yours, Theirs), possessive adjectives (My, Your, His, Her, Its, Our, Your, Their), personal pronouns:This is either about the (subject you or them the object, I, Me, You, He, Him, She, Her, It, We, Us, Them, They) and lastly I would say the Plurality (something Plural also indicates or shows possession).